Mechanism for actuating the awl, needle, and needle-guide of lock-stitch sewing-machines.



E. EIIICKSON.

MECHANISM FOR ACTUYATING THE AWL, NEEDLE, AND NEEDLE GUIDE 0F LOCK STITCH SEWING MACHINES.

APPLICATION FILED JULY I7. I914.

2 SHEETSSHEET I.

Patented Aug. 10, 1915.

COLUMBIA PLANOGRAPH co wAsmNqToN, D. c.

E. ERICKSON.

MECHANISM FOR ACTUATING THE AWL, NEEDLE, AND NEEDLE GUIDE 0F LOCK STITCH I I SEWING MACHINES.

APPLICATION FILED IULY I7, 1914- 1,149,352. Patented Aug. 10, 1915.

2 SHEETS-SHEET 2.

Inventor:

EdWCU'dDETIEItSON by Mme! STAE EDWARD ERICKSON, 0F LYNN, MASSACHUSETTS, ASSIGNOR TO VICTOR SHOE MACHINERY 00., OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSA MECHANISM: FOR ACTUATING THE AWL, NEEDLE, AND NEEDLE-GUIDE OF LOCK-STITCH SEWING-MAOI-IIN ES.

Specification of Letters Patent. Patented Aug; 10 1915 Application filed July17, 1914. Serial No. 252,101.

To all whom it may concern:

Be it known that I, EDWARD ERIOKSON, a subject of the King of Sweden, and'a'resr dent of Lynn, in tliecounty. of Essex and State of Massachusetts, haveinvented certain new and useful Improvements in Mechanism for Actuating the'Awl, Needle, and Needle-Guide of Lock-Stitch Sewing- Machines, of which the following is'a specification.

This invention relates to shoe sewing machines, and more particularly to mechanism for actuating the awl, needle, and needle guide of a sewing machine ofthat type employing a curved hooked needle.

The object of the invention is to provide an improved mechanism for imparting the work-piercingmovements to the awl and needle and for moving the needle guide toward the work at the propertime to support the needle.

Another object is to provide means for producing a recessionin the movement of the needle near the limit of its movement away from the work so that the thread may be drawn from the barb of the needle by the shuttle without stripping or splitting.

These objects and such others as may hereinafter appear will best be understood from the following description and accompanying drawings of the preferred form of the invention.

Of the drawings: Figure l is an end ole vation of a sewing machineembodying the present invention. Fig. 2 is a section on the line 2-2 of Fig. 1. Fig. 3 is a detail view looking in the opposite direction from Fig. 1, showing the connection of the driving mechanism with the driven parts.' Fig. 4; is a view similar to Fig. 3, showing the parts in another position, and Fig. 5 is a detail View to be hereinafter described.

Similar characters designate like parts throughout the several figures of the draw- 1IIOS.

This invention is illustrated anddescribed as. embodied in the shoe-sewing 'machine shown in a loo-pending application, Serial No. 739,056, filed by the present inventor on December 28, 1912, but it is to be under stood that the machine of said application is selected for the purposes of illustration only, and that the invention may be equally well applied to various other sewing machines.

In the drawings, Figs. land 2 show a sewing machine having a base 30 provided with two uprights orstandards 31v and 32 carrying a work support 71, and a main cam shaft 34- mounted in suitable bearings carried by the standards and provided with a driving pulley 38. The shaft 34: also has secured thereon a vgear 39 which, through connections not shown, actuates a shuttle 53 carrying a bobbin 59. The parts described may be and preferably are identical with thecorresponding parts in the aforesaid application, to which reference may be had for a more complete description of the structurenot essential to the present invention.v

As shown in said application, the machine is provided with a needle'l51 secured in a carrier 1552 (Figs. 3 and l) mounted to oscillate'about a suitable pivot pin and an awl 17-1 secured in a carrier 173 mounted to oscillate about a pin l75. Suitable mechanism (not shown) is provided to move the awl carrier longitudinally of the pin 175 whereby the work is fed in the usual manner.

' The present invention contemplates the provision of new and improved means for imparting the oscillating movement to the awl and needle and also to the needle guide. The awl carrier has a radially extending arm 273 on the end of which is pivotally mounted a yoke 171 which is in turn pivotally connected'with the upper end of a link 170. The two pivots of the yoke 171, being at right angles to each other, provide for the oscillatory movement of the awl carrier and also for its lateral feeding movement without putting a lateral strain on the link,

170. The lower end of the link is connected with an arm 2.69 adjustably secured to a rock shaft 160 by meansof a slotted hub. and a clamp screw 260. The rock shaft is 6X,- tended through the standard 82 (see Fig. 2)

and provided with'a collarQOO which restrains the shaft from lateral .movement. The otherend of the shaft carries a disk 15.8

rigidly secured thereto or, if preferred, the

disk may be integral therewith. 'The'disk is mounted-in a bearing 161 formed in the s standard 31. The rock shaft is ocillated by a pitman 163 actuated by a crank pin 164 projecting from the side of the gear 39. The connection between the pitman and'the rock shaft is preferably made through an arm 201 rigidly mounted on the disk 158.

It is apparent that when the shaft 34 is rotated in the direction of the arrow, Fig. 1, the rock shaft 160 will be turned in a direction to move the arm 269- from the position shown in Fig. 3 to the position of Fig. 4, thereby causing the awl to pierce the work.

The needle guide 202 is actuated through connections with the rock shaft 160. A. link 204, pivotally connected at 203 on an extension of the needle guide, is connected at its lower end at 205 with a short arm 206 formed integral with the arm 269. By this construction the needle guide is actuated by the same means and in timedrelation with the awl, although on account of the difference in the length of the radii and the angular position of the arms 269 and 206, the movements imparted to these two parts are wholly difierent. On the first part of the movement of the rock shaft 160 from the position of Fig. 3, there is very little movement in the needle guide as the arm 206 is then passingdead center, in fact the needle guide may be considered as being at rest as the slight movement does not affect the operation of any of the parts.

In order to actuate the needle, the needle carrier 152' is provided with an arm 154 which is connected by a link 155 with an arm156 fixed on the end of a rock shaft 15? mounted to oscillate in the disk 161. The disk may be provided with a hub 20'? to support the inner portions of the rock shafts 157 and 160. The outer end of the rock shaft 157 has, adjustably secured thereto, an

arm 168 which is connected by a pitman 167 with'a crank pin166 carried bylthe gear 39. In order that the pitmen 163 and 167 may not interfere, the crank pin 166 is mounted on an arm 208 fixed on the end of the pin 164, the resulting motion being the same as though both pins were mounted directly in the gear 39. For the same reason the arms 168 and 201 are offset from each other. The

- motion imparted to the needle is the result of the combined action of the oscillation of the ,shaft157 about its own axis under the influence of the crank pin 166 and its bodily movement about the axis of the shaft 160 I as the shaft and disk are oscillated by the crank pin 164. Fig. 5 shows the approximate position of the two rock shafts after about ninety degrees of movement in the gear 39. I

It is apparent that various movements may be imparted to the needle by varying the leverage of the actuating parts and the angular relation between certain eccentrically mounted parts, such, for instance, as

however, to so proportion the parts which actuate the needle that'theneedle will have a recession of movement at about the time it is in its extreme-position away from the work. This recession or dip of the needle allows the thread to be freed from the barb of the needle by the action of the shuttle without danger of stripping the thread. It is to be understood that While the connections from the crank pin 166 have been described as the needle actuating mechanism and the connections from the crank pin 164 as the awl and needle guide actuating mechanism, the movement and time of. movement of the needle is produced by a combined action of the two pins.

It is believed that the operation of this invention will be apparent from the foregoing description and the drawings. The necessary time of operation of the working instrumentalities will be obvious to one skilled in the art. The awl 174 first pierces the work and in so doing assumes the position approximately as shown in Fig. 4. The awl is then moved laterally by any of the usual devices to feed the work and then understood from the foregoing description.

Having thus describedmy invention, I claim:

1. In a sewingmachine, the combination of a needle; a cylindrical oscillating member having a bearing therein eccentric to the axis of said member; a rock shaft for actuating the needle positioned in said bearing and adapted to be moved therewith; and means for oscillating said rock shaft about its own axis. 7

2. In a sewing machine, the combination of. an awl, a rock shaft for actuating the awl, a needle, a rock shaft for actuating the needle, and means for moving the needle rock-shaft bodily with the oscillation of the awl rock shaft. i 3. In a sewing machine, the combination of an oscillating needle; a needle guide; an awl; means for. oscillating said awl; and means actuated. by said awl oscillating means for positively and continuously oscillating said needle guide during the os' cillation of said awl.

4. In a sewing machine, the combination of a needle and a needle guide, and means for actuating the needle guide comprising a link connecting the needle guide with a pin adapted to oscillate in an arc of a circle and arranged to pass the dead center when the needle guide is advanced toward the work.

5. In a sewing machine, the combination of a needle, a needle guide and an awl, a rock shaft, a member secured thereto having two arms, a link connecting the awl with one arm, and a link connecting the needle guide with the other arm.

6. In a sewing machine, the combination of a needle, a needle guide and an awl, a rock shaft, two arms mounted thereon, a link connecting the awl with one of the arms on the rock shaft, a link connecting the needle guide with the other arm on the rock shaft, and means for actuating the rock shaft to cause the needle guide link to pass a dead center.

7. In a sewing machine, stitch forming mechanism including a shuttle and a curved hooked needle, a shaft having two cranks, a rock shaft mounted to swing, a pitman oonnecting one of said cranks to swing said rock shaft, a second pitman connecting the other crank with the rock shaft to oscillate it, and a connection from said rock shaft to the needle carrier to irregularly actuate the latter.

8. In a sewing machine, stitch forming mechanism including a shuttle and a curved hooked needle, an oscillating awl, a shaft having two cranks, a rock shaft mounted to swing, a pitman connecting one of said swinging support, and connections from said rock shaft to the needle carrier.

10. In a sewing machine, the combination of a needle; a needle guide; an awl; an oscillating member; and means connected with said oscillating member for imparting positive and continuous movement to said needle guide and awl simultaneously.

11. In a sewing machine, the combination of a needle; a needle guide; an awl carrier; an oscillating member having two lateral projections; a link between one projection and the awl carrier; and another link between the other projection and the needle guide.

12. In a sewing machine, the combination of a needle; a needle guide; an awl carrier; an oscillating member having two lateral projections at different distances from the axis of said oscillating member; a link between the outer projection and the awl car rier; and another link between the inner projection and the needle guide.

13. In a sewing machine, the combination of an oscillating needle; a needle guide; an awl; and a single means for positively and continuously actuating said needle guide and awl at different speeds for predetermined periods.

lt. In a sewing mechine, the combination of an oscillating needle; a needle guide; an awl; and a single means for positively and continuously oscillating said awl for a predetermined period and simultaneously actuating said needle guide positively and CO1]: tinuously during the oscillation of said awl.

Signed by me at Boston, Mass, this 18th day of June, 1914.

EDW'ABD ERIGKSON.

Witnesses:

. MAURICE B. SPINozA, WALTER E. LOMBARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents Washington, D. C. 

